Hello!
I think I found problem.
CurlFTPFS set CURLOPT_FTP_SSL option, but I buld curl without SSL support.
I not understand another - CurlFTPFS set CURLOPT_ERRORBUFFER to
error_buf (static char error_buf[CURL_ERROR_SIZE]) and use follow define
for set curl options:
#define curl_easy_setopt_or_die(handle, option, ...) \
   do {\
     CURLcode res = curl_easy_setopt(handle, option, __VA_ARGS__);\
     if (res != CURLE_OK) {\
       fprintf(stderr, "Error setting curl: %s (%d)\n", error_buf,
__LINE__);\
       exit(1);\
     }\
   }while(0)
I add output line number for found error place.
Why I not get human readable error messages if CURLOPT_ERRORBUFFER point
to buffer for error message?

-- 
Best regards,
Brilliantov Kirill Vladimirovich
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